Question: wrote:
I have a 99-ZX9R, your Ti. needles, BMC filter, 6 degree advancer, Akrapovic system.

I have a lean condition at part throttle high & low speed. The bike pulls clean & hard from low RPM to red line at full throttle. I have 42 pilot jets, 3 1/2 turns out on screws. I have it a little rich at idle but that helped the lean spot a little. The only adjustment that seems to make the lean spot better is to richen the float. I have the float set at 11-1/2 MM.

What is the limit on the setting 10mm,9mm?? I had everything set OK until I put the 6 deg advancer on. That's when I got the lean spot & have been trying everything to get it back. I don't want to give up the advancer because I got better low end & 2-1/2 HP on the dyno. Main jets are 158 & 160, needle is all the way down -Clip at the top.

I have had main jets ,needles, float up & down . I was going to set the float at 10mm. What do you think?



It's not real common on other bikes to have the +6 advance hurt cruise UNLESS it was too far retarded and the stock curve didn't allow enough time for the delivered fuel to burn. Advancing the timing to where there's enough time to burn all the fuel (as compared with not enough time to burn the supplied fuel) may require additional fuel. That's the bad news (you aren't done tuning!). The good news is that, now that you have better timing - after you add additional fuel, you will be rewarded with better power and response than you could ever get with the more retarded, stock settings, as a rule.

If opening the fuel screws helped the cruise, but hurts the idle, I'd try #45 pj's and readjust the mixture screws for best idle again.

Raising the fuel level seems like an OK method to richen the cruise - BUT - the fuel level should be set for BEST full throttle / 3k performance primarily. It possible that the fuel level is too low (lean) now?

Highest fuel level (smallest float height measurement)- it's a mechanical limit - brake hard to a stop with the clutch in and no throttle. If the bike stumbles and dies when you stop because fuel sloshed forward and up through the needle jet and into the bore of the carb - well, there you go - - whatever it's set at - it's too high.

I haven't explored the higher fuel levels that you are talking about.

Have you tried larger main jets?? Maybe the mains are too small. That will lean out the cruise, too.

Use the main jet that produces the best topend on an EC997 Eddy Current Dyno, on the track or any other safe place. A dj dyno is not a good way to select the best main jet due to the short loading time that the inertia dynos apply.





Absolutely NO carb parts sold in California.

New and improved
Suzuki Teka SFI 2
with new TPS display and "MMT" Memory Module Tuner feature

Finally - Quick, easy, cost effective Suzuki tuning with no expensive "add-on boxes"
Suzuki cruisers and sportbikes

Please click here for more info

Contact Factory Pro
M-F, 9am - 5pm, Pacific time, -7 or -8 GMT

800 869-0497
 USA and Canada

415 883-5620

no fax

Factory Pro
101c Roblar Drive
Novato, CA

If it's
4pm at Factory Pro it's 9am in eastern Australia.

parts information

EC997 dynamometer information

Product Support /Tech SECTION
click here

And most importantly
Restart back at the HOME page and click on the red box in the top left to find the bike that you want parts for...

restart at HOME page


This Tuning Site has been visited by
people. - the oldest counting service on the web
Clock widget          




The below links are people and companies that are consistently impressive with their continual uniqueness and dedication to providing traditionally valued, quality products and services.

Flight Training - train with AMA race winner Todd Harrington.

The Harringtons own American Flyers, one of the most established flight training facilities in the USA - 8 locations -

Train to Win
The Rich Oliver Mystery School will help you discover your hidden inner strength. 
It will challenge you. It will teach you a new way of thinking and a new way of riding. You can take your riding to an exciting new level!  

We use a variety of proven drills and training techniques. 
Practicing these techniques with our Yamaha dirt track trainers will enhance your abilities both on the track or the street.  

It doesn't matter what you ride or race, the Rich Oliver Mystery School improves everyone's skill level and mindset!

WW2 vintage flying Special

Book a sightseeing flight over the Wine Country or a Kamikaze aerobatic flight or a biplane flight over famous Sonoma Raceway, the Golden Gate Bridge and the San Francisco Bay for one or two during the spring and get a free souvenir t shirt!
NEW!  Ask about the P-40 and P-51 flights!

707 938 2444

Just tell them that you saw this on the Factory Pro website!
Northern California's most unforgettable flying experience.  No experience required.  Open weekends! Call ahead in the winter.

Make your next tour Unforgettable,  Affordable and Exotic.
Superbike Tours Thailand - See you there.
Supwebike Tours Thailand
The extension of the laboratory for engines of the Swiss Federal Institute of Technology was completed in about 1935. Its architect was Rudolf Otto Salvisberg (1882-1940). He had a successful career in Berlin but returned to Switzerland after the advent of the Nazis. His architectural style was somewhat similar to that of Erich Mendelsohn. The staircase of the laboratory is in normal use but well preserved.
Edited to the tunes of Chemical Residue by Herbie Hancock.

Artisan Crafted Fine Cheeses – Since 1865   -    Specializing in Handmade Brie & Camembert

Marin French Cheese Co., also known as The Cheese Factory and Rouge et Noir is not just the oldest cheese manufacturer in the country, but a vacationers and day trippers destination as well as a unique part of American History. Located north of San Francisco, east of Napa County, west of Pt. Reyes and Olema and south of Sonoma County, Marin French has produced hand crafted Artisan soft ripened cheese since 1865. Rouge et Noir cheeses are similar to French and European varieties but reflect the characteristics of Northern California, producing it's own regional style.